CVE-2021-41773
Vulnerability from cvelistv5
Published
2021-10-05 08:40
Modified
2025-02-04 14:42
Severity ?
Summary
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.
References
security@apache.orghttp://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
security@apache.orghttp://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.htmlExploit, Third Party Advisory, VDB Entry
security@apache.orghttp://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
security@apache.orghttp://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/05/2Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/07/1Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/07/6Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/08/1Exploit, Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/08/2Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/08/3Exploit, Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/08/4Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/08/5Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/08/6Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/09/1Mailing List, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/11/4Mailing List, Patch, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/15/3Mailing List, Patch, Third Party Advisory
security@apache.orghttp://www.openwall.com/lists/oss-security/2021/10/16/1Mailing List, Third Party Advisory
security@apache.orghttps://httpd.apache.org/security/vulnerabilities_24.htmlRelease Notes, Vendor Advisory
security@apache.orghttps://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3EMailing List, Patch
security@apache.orghttps://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3EMailing List
security@apache.orghttps://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3EMailing List
security@apache.orghttps://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3EMailing List
security@apache.orghttps://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3EMailing List
security@apache.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/Release Notes
security@apache.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/Release Notes
security@apache.orghttps://security.gentoo.org/glsa/202208-20Third Party Advisory
security@apache.orghttps://security.netapp.com/advisory/ntap-20211029-0009/Third Party Advisory
security@apache.orghttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZThird Party Advisory
security@apache.orghttps://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/05/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/07/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/07/6Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/08/1Exploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/08/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/08/3Exploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/08/4Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/08/5Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/08/6Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/09/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/11/4Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/15/3Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/10/16/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://httpd.apache.org/security/vulnerabilities_24.htmlRelease Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3EMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f%40%3Cusers.httpd.apache.org%3EMailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3EMailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45%40%3Cannounce.apache.org%3EMailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3EMailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/Release Notes
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/Release Notes
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202208-20Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20211029-0009/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Version: Apache HTTP Server 2.4 2.4.49
 Create a notification for this product.
CISA Known exploited vulnerability
Data from the Known Exploited Vulnerabilities Catalog

Date added: 2021-11-03

Due date: 2021-11-17

Required action: Apply updates per vendor instructions.

Used in ransomware: Known

Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-41773

Show details on NVD website

To clipboard 

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    "dateUpdated": "2025-02-04T14:42:20.035Z",
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      "dateAdded": "2021-11-03",
      "dueDate": "2021-11-17",
      "knownRansomwareCampaignUse": "Known",
      "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-41773",
      "product": "HTTP Server",
      "requiredAction": "Apply updates per vendor instructions.",
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      "vendorProject": "Apache",
      "vulnerabilityName": "Apache HTTP Server Path Traversal Vulnerability"
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2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)\", \"refsource\": \"MLIST\"}, {\"url\": \"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html\", \"name\": \"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html\", \"refsource\": \"MISC\"}, {\"url\": \"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html\", \"name\": \"http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html\", \"refsource\": \"MISC\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/10/11/4\", \"name\": \"[oss-security] 20211011 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)\", \"refsource\": \"MLIST\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/\", \"name\": \"FEDORA-2021-2a10bc68a4\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/\", \"name\": \"FEDORA-2021-aaf90ef84a\", \"refsource\": \"FEDORA\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/10/15/3\", \"name\": \"[oss-security] 20211015 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)\", \"refsource\": \"MLIST\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2021/10/16/1\", \"name\": \"[oss-security] 20211016 Re: CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)\", \"refsource\": \"MLIST\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2022.html\", \"name\": \"https://www.oracle.com/security-alerts/cpujan2022.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20211029-0009/\", \"name\": \"https://security.netapp.com/advisory/ntap-20211029-0009/\", \"refsource\": \"CONFIRM\"}, {\"url\": \"http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html\", \"name\": \"http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html\", \"refsource\": \"MISC\"}, {\"url\": \"http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html\", \"name\": \"http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://security.gentoo.org/glsa/202208-20\", \"name\": \"GLSA-202208-20\", \"refsource\": \"GENTOO\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration \\\"require all denied\\\", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2021-41773\", \"STATE\": \"PUBLIC\", \"TITLE\": \"Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49\", \"ASSIGNER\": \"security@apache.org\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-41773\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-04T14:42:20.035Z\", \"dateReserved\": \"2021-09-29T00:00:00.000Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2021-10-05T08:40:12.000Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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